From 9cd05ad2910b55238e3c720c99ad896dc538301b Mon Sep 17 00:00:00 2001 From: Lan Tianyu Date: Mon, 25 Feb 2019 22:31:14 +0800 Subject: [PATCH] x86/hyper-v: Fix definition of HV_MAX_FLUSH_REP_COUNT The max flush rep count of HvFlushGuestPhysicalAddressList hypercall is equal with how many entries of union hv_gpa_page_range can be populated into the input parameter page. The code lacks parenthesis around PAGE_SIZE - 2 * sizeof(u64) which results in bogus computations. Add them. Fixes: cc4edae4b924 ("x86/hyper-v: Add HvFlushGuestAddressList hypercall support") Signed-off-by: Lan Tianyu Signed-off-by: Thomas Gleixner Cc: kys@microsoft.com Cc: haiyangz@microsoft.com Cc: sthemmin@microsoft.com Cc: sashal@kernel.org Cc: bp@alien8.de Cc: hpa@zytor.com Cc: gregkh@linuxfoundation.org Cc: devel@linuxdriverproject.org Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20190225143114.5149-1-Tianyu.Lan@microsoft.com --- arch/x86/include/asm/hyperv-tlfs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index 705dafc2d11a..2bdbbbcfa393 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -841,7 +841,7 @@ union hv_gpa_page_range { * count is equal with how many entries of union hv_gpa_page_range can * be populated into the input parameter page. */ -#define HV_MAX_FLUSH_REP_COUNT (PAGE_SIZE - 2 * sizeof(u64) / \ +#define HV_MAX_FLUSH_REP_COUNT ((PAGE_SIZE - 2 * sizeof(u64)) / \ sizeof(union hv_gpa_page_range)) struct hv_guest_mapping_flush_list { -- 2.30.2